I've recently had that happen as well. I was playing a game with a friend, yet the table was too high to get a clear view of the board, so we put the board on our knees to have some more distance. I remember cursing my internet-only playing habits, but I don't think that actually is the problem.
We moved the board because the table was ridiculously high. If one could sit in seiza there would be no problem for distance to the board (but who can sit in seiza for an entire go game, these days? Not even pros can do that anymore). I'm guessing it's more of a problem of us having really bad posture, e.g.
Therefore we put our face closer to the board then should normally be the case.